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She is a world-class swimmer who represented Brazil at three consecutive Olympic Games and is one of the country's most successful and prominent female athletes.

Joana Maranhao has founded the campaign group Infancia Livre

Joana retired from swimming after the last Olympic Games in London, partly because she felt she could no longer compete at the top level and partly because she has a new battle to fight.

As a child Joana was repeatedly sexually abused over many years in a country and, in particular, a region where the issue is rarely talked about and where offenders are rarely prosecuted.

"When a child is raped or abused here, even if there's an investigation, the way it happens is never sympathetic to the victim," says Joana at her apartment in the northern city of Recife.

Joana was abused by someone she knew and trusted but that's not always the case.

"It's worse for poor kids in this region," Joana tells me.

"But it's not about how poor or rich you are. Here it was almost seen as normal and the police have nowhere near enough people to investigate."

Joana's "new race" - as she puts it - is her charity and campaign group, "Infancia Livre" (Free Childhood).

She's determined to help young people, many without the education and drive that she has, who are victims of abuse in a part of Brazil that has a terrible reputation and record for protecting its youth.

Recife, and the wider coastal region in the northern state of Pernambuco, is one of the fastest growing regions in Brazil.

With its long white beaches it's an increasingly popular destination and where four football World Cup games will be played his summer.

Recife will host four matches during the football World Cup

Economic growth has brought thousands of workers here from other parts of Brazil and overseas. But according to aid workers these areas are also frequented by men looking for sex, and that's often sex with children.

Just a block from the beach, as music blares from the open boot of a car, men stand around drinking and watching a group of women a few yards away.

This is the city's red light district but the difference here is that while they may dress and make themselves up like women some of these girls are only just in their teens. One in four sex workers here is thought to be a child.

Aginaide Lynch is a co-ordinator for the Happy Child charity here in Recife.

She works with street children or those caught up in the sex trade. They have a safe house and other centres in the city dedicated to trying to turn lives around but she admits that with minimal official help and facing such overwhelming challenges, it's just a drop in the ocean.

"In this region, the north-east, people come here specifically for this and it'll get worse during the cup," says Ms Lynch.

She says that for the so-called "sex tourists", it's "easy and formalised".

"Even when men arrive at the airport, taxi drivers or hotel staff help them to find girls. The police are usually absent or even compliant in the business of child abuse so we have to take care of the problem ourselves and get the kids off the streets."

A government poster campaign calls on the public to protect Brazil's children

It's not always girls and boys from the streets, with drugs addictions and absent family structures, that fall victim to the sex tourists.

Pregnant at 16, Ana's own childhood is already lost. She's not a prostitute but has been having sex since she was 12. Ana - not her real name - says girls here go with foreigners because they are wealthy and generous.

Ana is from a working class background and, although her dad no longer lives at home, her mother clearly cares about her daughter's plight. But when, exasperated, her mum went to the police, they didn't even recognise Anna as a victim.

"I've got lots of friend who go with foreigners - gringos. They come here for the girls, you know - working girls, Ana tells me as she sits surrounded by baby clothes, six months into her pregnancy.

She's clearly too young and too vulnerable for the situation she's in but shrugs her shoulders and says: "The guys have lots of money and give the girls loads of things like a place to live or jewellery."

Joana Maranhao's revelations about her past and her willingness to speak out have even led to a new law, in her name, extending the time by which perpetrators of crimes against children can be prosecuted.

But it's not enough and, especially here in the north of the country, there are cultural barriers to break down as well as legal ones.

Brazilian society is often accused of sexualising children. The Novina phenomenon, where internet videos and songs portray young girls as attainable, sexual objects, is strong in this region.

Jessica Barbosa fears the child sex trade will worsen during the World Cup

Jessica Barbosa is from the British charity Action Aid, which has several projects running in the area. In these poor areas, children are particularly vulnerable to the attentions of men with money and promises.

"It's a situation that we think is going to be worse in the World Cup because we have men from outside," she says.

"We have vulnerable girls who need money and who think they'll have a better life in other countries. And we have no serious public policies to prevent this situation."

Twelve-year-old Andrea is proof of that.

She has not been abused but only thanks to her mother's vigilance. She tells me how she's unable to rely on the law to stop older men harassing or trying to lure her daughter with gifts from clothes to popcorn.

So she's had to make her a virtual prisoner in her own home.

A high-profile global campaign, called "It's a Penalty" and fronted by English and Brazilian footballers, warns World Cup visitors not to take advantage of Brazil's reputation for easy sex.

In this World Cup city, kids high on drugs sell themselves for the price of a cup of coffee.

It's an ugly business that embarrasses Brazil when the country is showing itself off to the world.

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